Work-holding clamp



UNITED stares,

- HARRY INGRAHAM Yiinviinsorv wnsr soifiERv'ILLE; iviAssAciiUsE'TTs. f

worm-nonnina enzimi.

Applicationnied November 2e, 1919. fseriai No'. 340,356'.

To all @07mm it may concern Be it known that HARRY INGRAHAM LAviiRs, acitizen of the United States, and

a resident of l/Vest Somerville, in the county of Middlesex and State ofMassachusetts,

have invented certain new and useful lmprovements in iWork-HoldingClamps, of

which the following is a specification.

My invention relates generally to work holding clamps, and particularlyto a clamp for holding portions of carpenter o-r cabinet work togetheruntil the glue used for uniting the same has become sufficiently set.

It is a purpose of my invention to provide a clamp of this characterwhich is cf simple and eiiicient construction, and in which means isprovided for clamping a piece of work and forcing another piece of worklinto proper position with relation to the first piece of work, suchmeans being operable by a single element so that theV two functions areperformed simultaneously.

l will describeone form ofclamp ein-v bodyiiig my invention and willthen point out the novel features thereof in claims.

ln the accompanying drawings Figure 1 is a view, showing in perspective'two pieces of work having applied thereto one form of clamp embodyingmyV invention; e.

F ig.- 2 is a longitudinal section of the clamp in its app-lied positionupon the work; Fig. 3 is a transverse sectional view, taken on the line3-3 of Fig. 2; and

Fig. 4e is a similar view, taken onthe Vline 4 4; of Fig. 2.

Referring specifically to the-drawings, in which similar referencecharacters refer to similar parts, P and P designate a pair,

of plates of substantially U-shaped formation which are secured togetherin spaced' parallelism by pins 15 and 15av` and rods 16 arranged at theforward and rear ends of the plates, respectively. At points between theplates F and P the rods 16 lare provided with tubular sleeves 16a forthe purpose of maintaining the rear ends of the plates in proper spacedrelation. Fulcrumed upon thepins-15 and 15n at points intermediate theirends are a pair of jaws J and J which are preferably formed of wood. Theforward ends'of the jaws J and J are inturned and covered with sheets ofsoft material such as rubber or the like to prevent mar-V ring of theworkby the jaws. The rear ends l the plates l) and P of the jaws orthose ends disposed between are recessed upon their confronting faces toprovide inclined surfaces 18 between which is adapted to work anexpanding member M. As shown in Fig.

2, the expanding member is of wedge shaped formation and as shown inFig. fthe top and bottom Vwalls thereof are formed with tongues 19whichwork in grooves 120 formed i in the inclined faces 18. The frontside of the expanding member is recessed to receive a nut 21 andextending through the latter and the member is a screw threaded shaft22n The forward end of the shaft 22 is provided with a foot 23, whileitsrear end is formed with a crank 24 which is adapted to be operatedrbyahandle 25.

In the ,applied position ofthe clamp, as shown. in Figs. 1 and 2, one'piece of work A is vplaced between the parallelportionsof the plates Pand P and between the jaws'v J and J with one edge of the work bearingagainst the foot 23.- The other piece of work A rwhich is adapted toloe-glued tothe piece Av is properly positioned `with relation tothelatter' and is interposedbetween the outer ends of the-jaws J andJ.VWith the clamp in this position, it is obvious that iipon rotation ofthe shaft 22 a forward feeding of the same is effected by its lcoacf soItion with the nut 21 thereby forcing the e the contour of the member,Yand the inclined vsurfaces 18, itis obvious that an outward movement ofthe adjacent ends of the jaws isV effected to cause their forward endsto securely grip the piece of 'workA In this manner the two pieces ofwork are forced together and securely held until the glue has becomesufficiently set, whereby an efiicient uniting of the work is effected.It will be understood that'the clamp may be readily removed fromthejwork by'V rotating the shaft 22 in the Voppositedirection so vas tomove thefoot 23 out of engagement with the piece of work A and toV causea forward movement of theexpanding member, there by permitting theforward ends of the :jaws to disengage the piecer of work A. l f

Although 1 have herein shown andV def scribed only one form of clampembodyingVV -my invention, it is to be understood thati various changesand modifications may be made herein Without departing from the spiritof the invention or the spirit and scope ofthe appended claim. Y l

Having thus describedV my invention, l claim:

A clamp Comprising a pair of U-shaped p1ates5a-pair of jaws lcrumedbetween said plates, one of ythe ends of vsaid jaws 10 having theirconfronting faces recessed to provide oppositely inclined surfaces,@block interposed between said ends and having sliding engagement withsaid surfaces,`a

nut carried'by 'said block, a screw `threaded.

shaft extending through said block and threadedly engaging said nnt,3foot carried by said shaft, and acrank Jfor actuating the shaft. :i

` HARRY I'NGRAHAM LAvERe.

